Expression is not valid outside of WITH/ENDWITH (Error 1940)

You can use an expression of the form .property=some_value only within a WITH ... ENDWITH construct.

• This error might also occur if you are using .NULL. as an expression.

  Put quotes around the .NULL. to keep it from being identified as a property.

• You might have forgotten an ending period with a value such as true (.T.), false (.F.) or a null value (.NULL.)

  Check for matching periods on either side of the constant.